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The triangular numbers between 1 and 200 are 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 105, 120, 136, 153, 171, and 190. They are quite simple to find--each triangular number is one more than the difference between the previous two triangular numbers. For example, the difference between 55 and 66 is 11, so the next higher triangular number will be 78, 12 more than 66.

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15y ago

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